1. apparent motion an optical illusion of motion produced by viewing a rapid succession of still pictures of a moving object
  2. apparent horizon the line at which the sky and Earth appear to meet
  3. approximation a rough calculation of quantity or degree or worth
  4. apparition a ghostly appearing figure
  5. apparent movement an optical illusion of motion produced by viewing a rapid succession of still pictures of a moving object
  6. orientation the act of determining one's position
  7. intimation a slight suggestion or vague understanding
  8. appreciation understanding of the nature or meaning of something
  9. overestimation an appraisal that is too high
  10. apprenticeship the position of one working for an expert to learn a trade
  11. approbation official acceptance or agreement
  12. apparent clearly revealed to the mind or the senses or judgment
  13. onward motion the act of moving forward (as toward a goal)
  14. apparently seemingly; as far as one can tell
  15. apprentice someone who works for an expert to learn a trade
  16. aberration a state or condition markedly different from the norm
  17. preindication an event that is experienced as indicating important things to come
  18. appropriation a deliberate act of acquisition, often without permission
  19. underestimation an estimation that is too low
  20. Brownian motion the random motion of small particles suspended in a gas or liquid

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